County annual report · FIPS 33013
2023 Merrimack County, NH Power Outage Report
In 2023, customers in Merrimack County, NH went without power for an average of 5.3 hours, a total of 620K customer-hours (New Hampshire average 9.5 hours). That ranks 8th worst of 10 New Hampshire counties and 1401st of 2,977 nationally.
Compared with NH, the US and 2022
Coverage line is EAGLE-I's share of New Hampshire customers tracked each year.
Biggest outages in Merrimack County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 14, 2023 07:15 | March 18, 2023 04:15 | 3d 21h | 12,583 | 302K |
| 2 | December 18, 2023 08:45 | December 19, 2023 21:45 | 1d 13h | 6,843 | 37K |
| 3 | September 16, 2023 11:45 | September 17, 2023 07:45 | 20h | 6,431 | 18K |
| 4 | January 23, 2023 03:30 | January 26, 2023 11:45 | 3d 8h | 5,651 | 120K |
| 5 | May 17, 2023 19:45 | May 17, 2023 22:45 | 3h | 5,246 | 1,315 |
| 6 | August 13, 2023 00:15 | August 13, 2023 02:45 | 2h 30m | 3,544 | 2,135 |
| 7 | July 14, 2023 01:00 | July 14, 2023 09:00 | 8h | 2,833 | 9,016 |
| 8 | July 28, 2023 19:00 | July 29, 2023 01:45 | 6h 45m | 2,809 | 19K |
| 9 | February 8, 2023 17:00 | February 8, 2023 18:30 | 1h 30m | 2,297 | 579 |
| 10 | May 20, 2023 22:45 | May 21, 2023 10:15 | 11h 30m | 2,169 | 2,984 |
Outage episodes by size in 2023: 114 reached 100+ customers, 26 reached 1,000+ customers, 1 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Merrimack County reported on EIA Form 861 for 2023, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Public Service Co of NH | 2023 | 11.1 hrs | 1.50 | 84 min | 0.74 |
| Unitil Energy Systems | 2023 | 4.3 hrs | 1.55 | 1.5 hrs | 0.89 |
| New Hampshire Elec Coop Inc | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of New Hampshire's customers in 2023; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 115,899 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Merrimack County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Merrimack County, NH annual power outage report, 2023, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2023/new-hampshire/merrimack-county